Engineer transit



R. c. QUEsADA ENGINEER TRANSIT Fil ed Jan. 18, 1957 Se t, 20, 1938.

Eoq'olfo Zison Quesdda Fig 315 an upper plan view of same.

a; permitting to place the axis of socket I forming the polar axis of theattachment at any desired P tented Sept. 20, 1938 V ENGINEER TRAN SIT Rodolfo Corvison Quesada, Marianao, Cuba Application January 18, 1937, Serial No. 121,205

- In Cuba January 12, 1937 I 3 Claims. (01, 3361) v invention relates to engineer transits, and

' convertingan engineer transit into an-equato-rial or ,z enithi-instrumentpsuch means consisting in levelling" platform and the transit plate, for the I thegfigure's of the accompanying drawing, of

it has 'for'its object theprovision of means for an; attachment which is inserted between the purpose. of inclining the plate and readily placing it parallelly of the celestial equator, thereby the polar axis of the attachment extending par- "allel to the earths polar'axis,

The invention is described with reference to I whichiw Fig'." 1 ma side View of the attachment. I Fig.2 is a frontview' of same.

1 Fig. .4 'is an elevational" view of an engineer transit carrying the attachment in its place and I "the transit plate inclined at a certain angle as I 20 is the object of this invention.

The'transit attachmentconstituting the subject-matter of this invention consists in a socket I adapted to receive thevertical spindle of the transit after removingsame from.the socket of the' transit levelling platform I3, which sockets are both alike, said socket I being rotatably mounted by trunnions forming a horizontal rota 5 levelling platform I3.

tion axis 3 on standards II I fixed on a circular I base I5 provided with a central stem 2 forming 30 the vertical spindle ofthe attachment and which is adapted to be introduced in the socket of the ;The"rota'tion axis 3 ofthe socket I is secured q in'any position by means of a brake means actu- 35 1 a; ring Iploosely mounted on'one end of the axis 3 and-being provided with a'key 5 adapted to ating on: said rotationaxisand which consists in lockthe axis 3 at will through the medium of a'screwli 'threadedly lodged in the hollow of a tubular arm 4 projecting from the ring 4, thus angle, abutt 'I and a 'micrometric screw. I being I provided on the base I5 for insuring accurate ."For

setting of socket I.

placing the transit plate 9 parallel to the celestial equator and' the' polar axis I parallel to 'theiearths polar axis, the'following procedure I is followed: The limb of plate 9 is placed at zero;

the verticalspindle of the transit is introduced in socket I so that theaxis '3 remains perpeni.dicularly'to the coincidence axis of the telescope II], it being fixedin that positionb ascrew II .(Fig. 1); they instrument is levelled and the. telefsc opeapproximately directed to" the south pole -if the observeris in the north hemisphere and to thenorth pole if the observer is in the south hemisphere; the telescope I0 is then caused to rotate onthe declination axis I2 an angle upon the vertic'alilimb I6, equal to co-latitude of place of observation; the transit is caused to rotate on the axis 3 until the telescope I0 remains level; the telescope I0 is placed, by rotation on the declination axis I2, at an angle equal to the suns declination at the moment of observation; the

instrument is caused to rotate simultaneously on its vertical spindle 2 and the telescope II] on its polar axis I until the suns image remains right in the middle of the reticules of telescope I0,

whereupon the angle between that position and the zero in the'limb of plate 9 will be the hourangle; the telescope I0 is then caused to rotate to zero in the limb of plate 9, whereafter the telescope II] will remain on the meridian plane ,of the placeof observation and the plate 9 parallel tothe plane of the celestial equator.

It is obvious that the shape and construction details of the attachment may be altered, without by this reason it may be considered as altered the essential character of the invention which is such as claimed hereinafter.

What I claim is:

1. An engineer transit which is mounted on it levelling platform by means of an attachment comprising a socket rotatably mounted on a horizontal axis and adapted to receive a transit vertical spindle, means for securing the rotation axis of such socket in any position of the latter, and

' an adjustable stop for holding the socket in its Vertical position.

2. An engineer transit which is mounted on its levellingplatform through the medium of an attachment comprising a base provided with a spindle to be inserted into a socket of a levelling platform,.standards on the base, a socket placed between the standards and which is adapted to I receive a transit vertical spindle and provided having a vertical socket, a base with standards and having a central vertical stem to fit said vertical socket, a socket having trunnions mounted in bearings in said standards to be turned about a horizontal axis, a transit plate having a stem mounted in said last named socket to be turned on an axis normal to that of said trunnions, standards carried by said transit plate and having bearings, a telescope with trunnions mounted in said last named hearings to be turned on an axis normal to that on which the transit disc 10 may be turned, in virtue of all of which one may set said plateparallel to the celestial equator any day of the year and, when the plate is in this position, one may point the telescope tothe sun to enable the telescope to follow the daily path of the sun by revolving the telescope about the polar axis of the transit and making the necessary corrections in the vertical limb for the small variations of the sun due to the declination during the time of the observation.

RODOLFO CORVISON QUESADA. 

